Sheet-metal can.



D. BLOOM.

SHEET METAL CAN.

APPLIOATION FILED MAY 23, 1911.

1,030,455, Patented June 25, 191.2

F31 1 1 1;. ll 4 4- 7 4 WlTNESSES W7 4 INVEN'IOR I 0/7100 BL 0on7.

ATTORNEYS j STES T FFICE.

DAVID 131.com, or BERKELEY, CALIFORNIA.

SHEET-Merlin can.

Specification of'Iletters Patent. Patented June 25, 1912.

Application filed May es, 1911. Serial no. 628,907.

To all whom it may concern Be it known that I, DAVID BLooM, a citizen ofthe United States, and a residentof Berkeley, in the county of Alamedaand State of California, have invented certain new and usefulImprovements in Sheet Metal Cans, of which the following is aspecification.

The invention relates to sheet metal cans Another object of theinvention is to pro-.

vide a can having a closure which may be held to its seat by differentdegrees of pressure, depending on the degree of flexure of the spring.

Another object of the invention is to provide a closure which is placedin sprin -held engagement with the can by means o a rotation of theclosure of the can.

A further object of the inventionis to provide a closure which may besecured to the can before the products therein are processed and whichhas the quality of yielding slightly to allow the expanded air in thereceptacle to escape, as the air and contents expand under the action ofheat, and which will firmly seat itself on the can when the processingis discontinued and a partial vacuum. is formed within the can.

With these and other objects in view, as will more fully hereinafterappear, the invention consists of certain novel features of constructionand arrangement of parts, hereinafter fully described, illustrated inthe accompanying drawings and particularly pointed out 1n the appendedclaims, it being understood that various changes in the form,proportions, size, material and minor details of the structure may bemade without departing from the spirit or sacrificing any of theadvantages of the invention. 4

The following description explains at length thenatu-re of my saidimprovements and the manner in which I proceed to apply the same in theproduction of a sheet metal can, reference being had to the accompanyingdrawings.

Figure 1 is an elevation of a can provided with the improvement of myinvention, the upper part of the can being shown in section taken on theline m-w Fig. 3. Fig. 2 is a view similar to Fig. 1 and taken on theline y-y Fig. 3. Fig. 3 is a plan or top view of the can. Fig. 4 1s avertical section through a part of the can and cover showing the springfor holding the cover in place. Fig. 5 is a plan or top view of thecover. Fig. 6

is a side view of the cover, shown partly in section.

In the drawings I have shown the construction as applied to a sheetmetal can,

,and will confine the particular description to such construction, butit is to be understood that I do not limit myself to such application,as the invention may be applied to other receptacles with equalefficiency.

The can of my invention is provided on the interior adjacent the mouthwith two inclined surfaces arranged opposite each other and progressingdownward in the same gen eral direction. These inclined surfaces arepreferably formed on a separate piece of metal 2, which is attached tothe can body 3 at the mouth by being crimped or rolled to the can bodyas seen at 4. This provides a firm joint between the piece 2 and the canbody 3 and stiifens the mouth of the can diametrically.

The piece 2 is stamped to .have two inclined edges 5-6 which each extendsubstantially for half the circumference of the can. The inclined edges56 have the same slope so that the level of two points on the edges,

diametrically opposite each other is the same. The edges of the inclinedportions may be crimped into a bead 7 to form a smooth bearing surface.The piece 2 1s cut away at the points 8, lying between the inclinedsurfaces, to allow the spring 9 secured to the under side of the cover12 to ass, so that it may engage the inclined sur aces as the cover isrotated. A stop 13 is provided on the lower edge of the inclinedsurfaces to prevent a further rotation of the cover when the spring isat its greatest tension.

The cover 12 is preferably provided with a depending flange 14 beadedalong the lower edge and milled or knurled on the surface so that it maybe readily gripped by cover.

the hand. The body 15 of the cover is depressed so that it lies withinthe mouth of the can and is provided with a seat 16 for the spring 9.The spring is preferably held to the cover by means of the central rivet17 the depression 16 serving to prevent the spring from rotating withrespect to. the The cover is also providedwith a seat 18 for the packing19 which lies be.- tween the cover and the can. In order to allow thecover to be raised slightly to relieve the vacuum within the can, whenthe can is used for preserving by the vacuum process, I provide a slightdepression 21 on the can body adjacent the mouth. An in strument cantherefore be readily inserted under the cover to raise it slightly todestroy the vacuum before the cover is turned to open the can.

After the material has been placed in the can, the cover is placed overthe mouth and rotated. IWhen the ends of the spring registerwith theapertures 8 the sprm drops below the level of the inclined surfaces atthe upper end and the further rotation of the cover causes the springends to move along the inclined Surfaces, thereby flexing the spring andholding. the cover against the can. When the spring contacts with thestops 13 further rotation of the cover in that direction is prevented.

. Should it be desirable to preserve the con tents of the can by thevacuum process, the can is then heated and as the air and contentsexpand, the cover rises to allow the excess air to escape. Afterprocessing the can is cooled and the spring holds the cover tightlyagainst the can while the vacuum is forming.

y I claim: 7.

1. In a sheet metal can, an annular mem ber attached thereto at theupper edge and lying within the can, inclined edges on said member, acover having a depressed central portion lying in line with the upperends of said inclined edges and provided with a recess on its underface, and a flat spring having its intermediate portion attached to theunder surface of said depressed portion of the cover within said recessand having its end portions "lying within the can and engaging saidinclined edges when the cover is in place on the can.

2. A receptacle having internally arranged inclined edges adjacent toits mouth,

in combination with a cover adapted to seat on the upper edges of thereceptacle and a flat spring attached at its central portion to thecover and having its end portions adapt-.

ed to engage the inclined edges when the cover is seated on thereceptacle, whereby rotation of the cover causes the spring to bend tovary the pressure of the cover on the recept-acle.

DAVID BLOOM. Witnesses: j

H. G. PROST, P. S. PEDWELL.

